/*
 *  Copyright 2004 Clinton Begin
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.ibatis.sqlmap.engine.mapping.sql.dynamic.elements;

import com.ibatis.common.beans.Probe;
import com.ibatis.common.beans.ProbeFactory;

import java.util.Map;

public class IsPropertyAvailableTagHandler extends ConditionalTagHandler {

    private static final Probe PROBE = ProbeFactory.getProbe();

    public boolean isCondition(SqlTagContext ctx, SqlTag tag, Object parameterObject) {
        if (parameterObject == null) {
            return false;
        } else if (parameterObject instanceof Map) {
            return ((Map) parameterObject).containsKey(tag.getPropertyAttr());
        } else {
            String property = getResolvedProperty(ctx, tag);
            // if this is a compound property, then we need to get the next to the last
            // value from the parameter object, and then see if there is a readable property
            // for the last value.  This logic was added for IBATIS-281 and IBATIS-293
            int lastIndex = property.lastIndexOf('.');
            if (lastIndex != -1) {
                String firstPart = property.substring(0, lastIndex);
                String lastPart = property.substring(lastIndex + 1);
                parameterObject = PROBE.getObject(parameterObject, firstPart);
                property = lastPart;
            }

            if (parameterObject instanceof Map) {
                // we do this because the PROBE always returns true for 
                // properties in Maps and that's not the behavior we want here
                return ((Map) parameterObject).containsKey(property);
            } else {
                return PROBE.hasReadableProperty(parameterObject, property);
            }
        }
    }
}
